Optional Unwrapping with Closures

OptionalType+Exts.swift

public protocol OptionalType {
    associatedtype Wrapped
    var value: Wrapped? { get }
}

extension Optional: OptionalType {
    public var value: Wrapped? {
        return self
    }

    @discardableResult
    public func then(_ closure: (Wrapped) -> Void) -> Optional {
        if case .some(let item) = self {
            closure(item)
        }

        return self
    }

    public func otherwise(_ closure: () -> Void) {
        if case .none = self {
            closure()
        }
    }
}

Allows doing things like

MyObject(dependency1: xyz)
    .then { doSomethingWithObject($0) }
    .otherwise { print("This is nil") }

Or

MyViewController(dependency1: xyz)
    .then { [weak self] in self?.present($0, animated: true, completion: nil) }